2022 Volume 2022 Issue 1 Pages 73-79
Currently, traffic signal priority control for public transit buses and emergency vehicles is mainly provided by a system using optical beacons installed on the roadside, however we have developed a system using GNSS (location information) and mobile phone communication networks. The GNSS enables the service to be provided even in locations where optical beacons are not installed. In FOTs (Field Operational Tests) of traffic signal priority control, it was demonstrated that the non-passage rate of buses during extended green signal periods was reduced by 88.9% compared to that of optical beacons by continuously obtaining location information and travel speed using GNSS, and that finer traffic signal priority control was possible. In addition, FOTs were conducted in the Tokyo waterfront area using the mechanism developed in this technology development to distribute information on emergency vehicles (simulated) to automated vehicles. By providing the location information of emergency vehicles such as ambulances to the automated vehicle, it is possible to recognize their presence from a greater distance. We expect that the results of this technological development will be implemented in society as soon as possible with the goal of realizing "practical application of advanced automated driving with infrastructure cooperative system" as indicated in the SIP Roadmap of V2X Communication Methods for Cooperative Driving Automation.
